'''
Author: your name
Date: 2020-10-28 09:59:12
LastEditTime: 2020-10-28 10:04:08
LastEditors: Please set LastEditors
Description: In User Settings Edit
FilePath: \python-study\博客学习\file.py
'''
if __name__ == "__main__":
    f = open('readme.txt',"a+")
    line=f.readline()
    f.write('abc')
    f.close()